It doesn't need to be tech. From the Guidelines section of HN:
On-Topic: Anything that good hackers would find interesting. That includes more than hacking and startups. If you had to reduce it to a sentence, the answer might be: anything that gratifies one's intellectual curiosity.
Off-Topic: Most stories about politics, or crime, or sports, or celebrities, unless they're evidence of some interesting new phenomenon. Videos of pratfalls or disasters, or cute animal pictures. If they'd cover it on TV news, it's probably off-topic.
* California is free of drought for the first time in 25 years
* Inside the secret world of Japanese snack bars
* Danish pension fund divesting US Treasuries
* Driver killed and several injured after second train derails near Barcelona
* De-dollarization: Is the US dollar losing its dominance? (2025)
It's common to have things that are covered on TV news on the front page. It's more common for anything negative about Trump to be flagged, though.
“This doesn’t belong here” is perfectly valid reaction to stuff covered on a million other sites.